Don't have much time, but at startup
Go to START>>>RUN
Type in
shutdown -aHit Enter
This should buy you some time
If the above won't work try
Start>>Run>>Type in
cmdAt the command prompt
type in
shutdown -aNotice the space between the n and -
I believe that stinger has been updated for this virus
Download it to desktop and disconnect from the Internet and run it
If it doesn't help post back, I can find you a fix, just don't have time right now, sorry

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I would also like to see a hijackthis log, if you need a hand posting one, post back
Here's the download link for Stinger
http://vil.nai.com/vil/stinger/I'm assuming your running Windows xp or 2000